I've got a TSC Huskee 22" self propelled FWD, big back wheels hand me down that's ~17 years old now. It's been used a lot, I finally wore the original Briggs out about 2 years ago. It go to the point that the slightest clump of grass would bog it down and kill it. I thought new rings would solve its issues, but it was a homeowner series engine, just an aluminum bore with no sleeve, and it was worn well beyond spec.
In shopping for a replacement mower, we kind of decided we wanted electric start, but even used electric start mowers were pricey. Instead I bought a new 190cc electric start Briggs & Stratton from Surplus Center. Took some minor tinkering to adapt the FWD pulley and blade holder, added a cheap motorcycle battery, start solenoid, and start switch from Amazon, and wound up with a pretty stout mower.
I use Rotella T6, full synthetic in pretty much everything, Jeeps, mowers, pressure washer, etc. All my yard equipment gets non ethanol gas with Sta-Bil. Change the oil once a season. I rarely have issues.